{"id":29895,"date":"2026-07-08T16:16:07","date_gmt":"2026-07-08T08:16:07","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=29895"},"modified":"2026-07-09T16:09:58","modified_gmt":"2026-07-09T08:09:58","slug":"plc-i-o-signal-surge-protection-for-industrial-control-panels","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/","title":{"rendered":"Protecci\u00f3n contra sobretensiones de se\u00f1al de E\/S de PLC para paneles de control industrial"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"29895\" class=\"elementor elementor-29895\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d0d6290 e-flex e-con-boxed e-con e-parent\" data-id=\"d0d6290\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a00e48c elementor-widget elementor-widget-html\" data-id=\"a00e48c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\r\n  .leeyee-plc-signal-article {\r\n    --leeyee-blue: #004898;\r\n    --leeyee-blue-dark: #00346f;\r\n    --leeyee-soft-blue: #f4f8ff;\r\n    --leeyee-soft-border: #dbe8f7;\r\n    --leeyee-text: #1f2933;\r\n    --leeyee-muted: #5d6b7a;\r\n    --leeyee-warning: #fff8ea;\r\n    --leeyee-warning-border: #f3d58a;\r\n    max-width: 860px;\r\n    margin: 0 auto;\r\n    padding: 20px 18px 64px;\r\n    color: var(--leeyee-text);\r\n    font-size: 16.5px;\r\n    line-height: 1.72;\r\n  }\r\n\r\n  .leeyee-plc-signal-article * {\r\n    box-sizing: border-box;\r\n  }\r\n\r\n  .leeyee-plc-signal-article p {\r\n    margin: 0 0 16px;\r\n  }\r\n\r\n  .leeyee-plc-signal-article a {\r\n    color: var(--leeyee-blue);\r\n    text-decoration: none;\r\n    font-weight: 600;\r\n  }\r\n\r\n  .leeyee-plc-signal-article a:hover {\r\n  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10px 0;\r\n    padding: 12px 14px;\r\n    border: 1px solid var(--leeyee-soft-border);\r\n    border-radius: 12px;\r\n    background: #ffffff;\r\n  }\r\n\r\n  .leeyee-button-row {\r\n    display: flex;\r\n    flex-wrap: wrap;\r\n    gap: 12px;\r\n    margin-top: 18px;\r\n  }\r\n\r\n  .leeyee-plc-signal-article button.leeyee-site-popup-btn,\r\n  .leeyee-plc-signal-article button.leeyee-site-popup-btn:hover,\r\n  .leeyee-plc-signal-article button.leeyee-site-popup-btn:focus,\r\n  .leeyee-plc-signal-article button.leeyee-site-popup-btn:active,\r\n  .leeyee-plc-signal-article button.leeyee-inquiry-btn,\r\n  .leeyee-plc-signal-article button.leeyee-inquiry-btn:hover,\r\n  .leeyee-plc-signal-article button.leeyee-inquiry-btn:focus,\r\n  .leeyee-plc-signal-article button.leeyee-inquiry-btn:active {\r\n    display: inline-flex !important;\r\n    align-items: center !important;\r\n    justify-content: center !important;\r\n    min-width: 210px !important;\r\n    min-height: 48px !important;\r\n 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!important;\r\n    visibility: visible !important;\r\n    white-space: nowrap !important;\r\n    cursor: pointer !important;\r\n    position: relative !important;\r\n    z-index: 2 !important;\r\n    overflow: visible !important;\r\n    text-indent: 0 !important;\r\n    box-shadow: none !important;\r\n  }\r\n\r\n  .leeyee-plc-signal-article a.leeyee-article-btn:hover {\r\n    background: #00346f !important;\r\n    border-color: #00346f !important;\r\n    color: #ffffff !important;\r\n    -webkit-text-fill-color: #ffffff !important;\r\n    text-decoration: none !important;\r\n  }\r\n\r\n  .leeyee-plc-signal-article a.leeyee-article-btn span {\r\n    display: inline-block !important;\r\n    color: #ffffff !important;\r\n    -webkit-text-fill-color: #ffffff !important;\r\n    font-size: 15px !important;\r\n    font-weight: 800 !important;\r\n    line-height: 1.2 !important;\r\n    opacity: 1 !important;\r\n    visibility: visible !important;\r\n    white-space: nowrap !important;\r\n    text-indent: 0 !important;\r\n    position: relative !important;\r\n    z-index: 5 !important;\r\n    text-decoration: none !important;\r\n  }\r\n\r\n  .leeyee-plc-signal-article a.leeyee-article-btn.secondary,\r\n  .leeyee-plc-signal-article a.leeyee-article-btn.secondary:link,\r\n  .leeyee-plc-signal-article a.leeyee-article-btn.secondary:visited,\r\n  .leeyee-plc-signal-article a.leeyee-article-btn.secondary:hover,\r\n  .leeyee-plc-signal-article a.leeyee-article-btn.secondary:focus,\r\n  .leeyee-plc-signal-article a.leeyee-article-btn.secondary:active {\r\n    background: #ffffff !important;\r\n    color: #004898 !important;\r\n    -webkit-text-fill-color: #004898 !important;\r\n    border-color: #bcd2ee !important;\r\n  }\r\n\r\n  .leeyee-plc-signal-article a.leeyee-article-btn.secondary span {\r\n    color: #004898 !important;\r\n    -webkit-text-fill-color: #004898 !important;\r\n  }\r\n\r\n  .leeyee-plc-signal-article a.leeyee-article-btn.secondary:hover {\r\n    background: #f4f8ff !important;\r\n    color: #004898 !important;\r\n    -webkit-text-fill-color: #004898 !important;\r\n    border-color: #004898 !important;\r\n    text-decoration: none !important;\r\n  }\r\n\r\n  .leeyee-faq {\r\n    margin: 28px 0 0;\r\n  }\r\n\r\n  .leeyee-faq details {\r\n    margin: 12px 0;\r\n    padding: 16px 18px;\r\n    border: 1px solid var(--leeyee-soft-border);\r\n    border-radius: 14px;\r\n    background: #ffffff;\r\n  }\r\n\r\n  .leeyee-faq summary {\r\n    cursor: pointer;\r\n    font-weight: 800;\r\n    color: #172536;\r\n  }\r\n\r\n  .leeyee-faq details p {\r\n    margin-top: 12px;\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  @media (max-width: 768px) {\r\n    .leeyee-plc-signal-article {\r\n      padding: 14px 14px 44px;\r\n      font-size: 15.8px;\r\n      line-height: 1.68;\r\n    }\r\n\r\n    .leeyee-plc-signal-article h2 {\r\n      margin-top: 34px;\r\n      font-size: 25px;\r\n      line-height: 1.3;\r\n    }\r\n\r\n    .leeyee-plc-signal-article h3 {\r\n      font-size: 20px;\r\n    }\r\n\r\n    .leeyee-article-intro,\r\n    .leeyee-quick-answer,\r\n    .leeyee-note-box,\r\n    .leeyee-warning-box,\r\n    .leeyee-check-box,\r\n    .leeyee-product-box,\r\n    .leeyee-cta-box {\r\n      padding: 18px 16px;\r\n      border-radius: 15px;\r\n    }\r\n\r\n    .leeyee-article-intro .lead {\r\n      font-size: 18px;\r\n    }\r\n\r\n    .leeyee-article-figure {\r\n      margin: 22px 0 28px;\r\n      border-radius: 14px;\r\n    }\r\n\r\n    .leeyee-article-figure figcaption {\r\n      padding: 10px 12px;\r\n      font-size: 13px;\r\n    }\r\n\r\n    .leeyee-two-col {\r\n      grid-template-columns: 1fr;\r\n      gap: 14px;\r\n    }\r\n\r\n    .leeyee-table {\r\n      min-width: 680px;\r\n      font-size: 14px;\r\n    }\r\n\r\n    .leeyee-table th,\r\n    .leeyee-table td {\r\n      padding: 11px 12px;\r\n    }\r\n\r\n    .leeyee-step {\r\n      padding: 16px 16px 16px 58px;\r\n    }\r\n\r\n    .leeyee-button-row {\r\n      flex-direction: column;\r\n    }\r\n\r\n    .leeyee-plc-signal-article button.leeyee-site-popup-btn,\r\n    .leeyee-plc-signal-article button.leeyee-inquiry-btn,\r\n    .leeyee-plc-signal-article a.leeyee-article-btn {\r\n      width: 100% !important;\r\n      min-width: 100% !important;\r\n      white-space: normal !important;\r\n    }\r\n\r\n    .leeyee-plc-signal-article button.leeyee-site-popup-btn span,\r\n    .leeyee-plc-signal-article button.leeyee-site-popup-btn .w-btn-label,\r\n    .leeyee-plc-signal-article button.leeyee-inquiry-btn span,\r\n    .leeyee-plc-signal-article button.leeyee-inquiry-btn .w-btn-label,\r\n    .leeyee-plc-signal-article a.leeyee-article-btn span {\r\n      white-space: normal !important;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<article class=\"leeyee-plc-signal-article\">\r\n\r\n  <div class=\"leeyee-article-kicker\">Gu\u00eda t\u00e9cnica para paneles de control PLC<\/div>\r\n\r\n  <section class=\"leeyee-article-intro\">\r\n    <p class=\"lead\">Un gabinete de PLC puede ya tener un dispositivo de protecci\u00f3n contra sobretensiones de CA en la entrada de alimentaci\u00f3n, pero eso no protege autom\u00e1ticamente los terminales de se\u00f1al del PLC.<\/p>\r\n    <p>Muchas fallas de PLC se producen a trav\u00e9s de las l\u00edneas \u201cpeque\u00f1as\u201d: entrada digital, salida digital, entrada anal\u00f3gica, salida anal\u00f3gica, RS485, bucle 4-20mA, cable de sensor, cable I\/O remoto y cableado de dispositivos de campo.<\/p>\r\n    <p>Esta gu\u00eda explica cu\u00e1ndo las l\u00edneas I\/O y de se\u00f1al de PLC necesitan protecci\u00f3n contra sobretensiones, c\u00f3mo elegir un SPD de se\u00f1al adecuado y qu\u00e9 informaci\u00f3n deben confirmar los fabricantes de paneles o los compradores de OEM antes de realizar un pedido.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"leeyee-quick-answer\">\r\n    <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u00cdndice<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#quick-answer\" >Respuesta R\u00e1pida<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#why-plc-signal-lines-need-surge-protection\" >Por qu\u00e9 las l\u00edneas de se\u00f1al PLC necesitan protecci\u00f3n contra sobretensiones<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#plc-io-surge-protection-which-lines-need-signal-spd\" >Protecci\u00f3n contra sobretensiones PLC I\/O: \u00bfQu\u00e9 l\u00edneas necesitan SPD de se\u00f1al?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#do-you-need-surge-protection-on-every-plc-io-point\" >\u00bfNecesita protecci\u00f3n contra sobretensiones en cada punto I\/O de PLC?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#signal-spd-vs-spd-remote-alarm-contact\" >SPD de se\u00f1al vs contacto de alarma remota SPD<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#signal-spd-selection-for-plc-dido-aiao-rs485-and-4-20ma-lines\" >Selecci\u00f3n de SPD de se\u00f1al para l\u00edneas PLC DI\/DO, AI\/AO, RS485 y 4-20mA<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#recommended-selection-by-plc-signal-type\" >Selecci\u00f3n recomendada por tipo de se\u00f1al PLC<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#plc-signal-spd-parameter-matrix\" >Matriz de par\u00e1metros de SPD de se\u00f1al PLC<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#recommended-leeyee-signal-spd-for-plc-and-rs485-lines\" >SPD de se\u00f1al LEEYEE recomendado para l\u00edneas PLC y RS485<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#where-should-the-signal-spd-be-installed\" >\u00bfD\u00f3nde debe instalarse el SPD de se\u00f1al?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#what-happens-if-plc-signal-lines-are-not-protected\" >\u00bfQu\u00e9 sucede si las l\u00edneas de se\u00f1al PLC no est\u00e1n protegidas?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#before-ordering-signal-spd-for-plc-panels\" >Antes de pedir SPD de se\u00f1al para paneles de PLC<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#common-selection-mistakes\" >Errores comunes de selecci\u00f3n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#related-reading\" >Lectura relacionada<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#faq-plc-io-signal-surge-protection\" >FAQ: Protecci\u00f3n contra sobretensiones de se\u00f1al I\/O de PLC<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/#need-help-choosing-signal-spd-for-a-plc-control-panel\" >\u00bfNecesita ayuda para elegir SPD de se\u00f1al para un panel de control PLC?<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer\"><\/span>Respuesta R\u00e1pida<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <p><strong>Utilice protecci\u00f3n contra sobretensiones de se\u00f1al para l\u00edneas I\/O y de comunicaci\u00f3n de PLC cuando el cable sale del gabinete de control, corre al aire libre, se conecta a instrumentos de campo, cruza entre m\u00e1quinas o edificios, o est\u00e1 instalado cerca de motores, VFDs, bombas, solenoides o cables de alimentaci\u00f3n largos.<\/strong><\/p>\r\n    <p>Un SPD de tipo 2 de CA protege la entrada de potencia del gabinete. Un SPD de se\u00f1al protege el camino de bajo voltaje que ingresa al terminal del PLC. Estos son puntos de protecci\u00f3n diferentes y no deben ser reemplazados uno por el otro.<\/p>\r\n    <p>Para las se\u00f1ales, datos y circuitos de comunicaci\u00f3n, la selecci\u00f3n de SPD normalmente se considera bajo el alcance de protecci\u00f3n contra sobretensiones en la l\u00ednea de se\u00f1al, com\u00fanmente referenciado por la IEC 61643-21, en lugar de las reglas de selecci\u00f3n de SPD de alimentaci\u00f3n CA.<\/p>\r\n  <\/section>\r\n\r\n  <figure class=\"leeyee-article-figure\">\r\n    <img src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/plc-control-panel-signal-surge-protection-architecture-scaled.webp\" alt=\"PLC control panel signal surge protection architecture for AC power 24VDC control power RS485 sensor and I O lines\" loading=\"lazy\" decoding=\"async\">\r\n    <figcaption>La protecci\u00f3n contra sobretensiones del panel de control de PLC debe separar la protecci\u00f3n del lado de alimentaci\u00f3n, la protecci\u00f3n de la alimentaci\u00f3n de control de 24V CC y la protecci\u00f3n de la l\u00ednea de se\u00f1al.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>L\u00ednea de PLC<\/th>\r\n          <th>Ejemplo T\u00edpico<\/th>\r\n          <th>Cuando se Recomienda SPD de Se\u00f1al<\/th>\r\n          <th>Significado del comprador<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>ENTRADA \/ SALIDA<\/td>\r\n          <td>Entrada digital de 24V, salida por rel\u00e9, se\u00f1al de estado de la m\u00e1quina<\/td>\r\n          <td>Cableado de campo largo, equipos exteriores, cargas inductivas, secciones de m\u00e1quina separadas<\/td>\r\n          <td>Protege los terminales de E\/S de PLC de voltajes transitorios que ingresan a trav\u00e9s de cables de campo.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Entrada anal\u00f3gica \/ salida anal\u00f3gica<\/td>\r\n          <td>Bucle de transmisor de 0-10V, 4-20mA<\/td>\r\n          <td>El sensor o transmisor est\u00e1 fuera del gabinete o el cable est\u00e1 expuesto a acoplamientos de sobretensi\u00f3n<\/td>\r\n          <td>Ayuda a reducir da\u00f1os y lecturas inestables en m\u00f3dulos anal\u00f3gicos.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>RS485 \/ Modbus RTU<\/td>\r\n          <td>PLC a medidor, inversor, E\/S remota, dispositivo SCADA<\/td>\r\n          <td>Cable de bus largo, RS485 al aire libre, m\u00faltiples gabinetes, diferentes zonas de conexi\u00f3n a tierra<\/td>\r\n          <td>Protege los puertos de comunicaci\u00f3n sin usar un SPD de alimentaci\u00f3n CA en una l\u00ednea de datos.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>L\u00ednea de Sensor<\/td>\r\n          <td>Sensor de proximidad, sensor de presi\u00f3n, sensor de nivel, medidor de flujo<\/td>\r\n          <td>El cable del sensor corre a lo largo de bandejas de campo, cerca de motores o fuera del \u00e1rea protegida del gabinete<\/td>\r\n          <td>Protege el d\u00e9bil camino de se\u00f1al antes de que llegue a los terminales de entrada del PLC.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Cable de dispositivo de campo<\/td>\r\n          <td>Actuador de v\u00e1lvula, se\u00f1al de bomba, estado de equipo remoto<\/td>\r\n          <td>El cable conecta equipos en otra zona, otro gabinete o \u00e1rea exterior<\/td>\r\n          <td>Reduce el riesgo de sobrevoltaje debido a diferencias de potencial a tierra y transitorios inducidos.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-plc-signal-lines-need-surge-protection\"><\/span>Por qu\u00e9 las l\u00edneas de se\u00f1al PLC necesitan protecci\u00f3n contra sobretensiones<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Un panel de control PLC no est\u00e1 protegido solamente a trav\u00e9s de su cable de alimentaci\u00f3n entrante. La energ\u00eda de sobrevoltaje puede entrar a trav\u00e9s de cualquier camino conductor conectado al sistema PLC.<\/p>\r\n\r\n  <p>Para paneles de control industrial, los caminos m\u00e1s comunes son:<\/p>\r\n\r\n  <ul>\r\n    <li>Alimentaci\u00f3n de CA entrante al gabinete de control.<\/li>\r\n    <li>Bus de alimentaci\u00f3n de control de 24VCC dentro del gabinete.<\/li>\r\n    <li>Cableado de E\/S de PLC conectado a dispositivos de campo.<\/li>\r\n    <li>L\u00edneas de RS485, Modbus RTU, telemetr\u00eda y monitoreo remoto.<\/li>\r\n    <li>Cables de sensores e instrumentos que corren fuera del gabinete.<\/li>\r\n  <\/ul>\r\n\r\n  <p>Esta es la raz\u00f3n por la cual un gabinete de control puede necesitar tanto SPDs de potencia como SPDs de se\u00f1al. El SPD de potencia se ocupa de la energ\u00eda de sobretensi\u00f3n en el lado de la fuente de alimentaci\u00f3n. El SPD de se\u00f1al se encarga de la sobretensi\u00f3n transitoria en el lado de control o comunicaci\u00f3n de bajo voltaje.<\/p>\r\n\r\n  <div class=\"leeyee-warning-box\">\r\n    <h3>Importante: Un SPD de CA NO protege cada terminal de PLC.<\/h3>\r\n    <p>Si un cable de sensor de 50 metros entra en el gabinete y se conecta directamente a un m\u00f3dulo de entrada de PLC, una sobretensi\u00f3n inducida en ese cable puede alcanzar el PLC antes de que el SPD de CA tenga la oportunidad de ayudar.<\/p>\r\n    <p>Por esta raz\u00f3n, los SPDs de se\u00f1al deben ser considerados en el punto de entrada del cable de campo, especialmente donde los cables son largos, externos, expuestos o conectados a equipos remotos.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"plc-io-surge-protection-which-lines-need-signal-spd\"><\/span>Protecci\u00f3n contra sobretensiones PLC I\/O: \u00bfQu\u00e9 l\u00edneas necesitan SPD de se\u00f1al?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>No todos los peque\u00f1os cables de se\u00f1al necesitan un SPD separado. La decisi\u00f3n correcta depende de la ruta del cable, la exposici\u00f3n, el entorno de instalaci\u00f3n, la importancia del sistema y la especificaci\u00f3n del proyecto.<\/p>\r\n\r\n  <div class=\"leeyee-two-col\">\r\n    <div class=\"leeyee-mini-card\">\r\n      <span class=\"leeyee-small-label\">Mayor riesgo<\/span>\r\n      <h3>Generalmente vale la pena proteger<\/h3>\r\n      <ul>\r\n        <li>Sensores y transmisores exteriores.<\/li>\r\n        <li>L\u00edneas de bus RS485 entre gabinetes.<\/li>\r\n        <li>Cables de E\/S remotos.<\/li>\r\n        <li>Bucles de 4-20mA de instrumentos de campo.<\/li>\r\n        <li>Cables de se\u00f1al cerca de VFDs, motores, bombas o cables de potencia largos.<\/li>\r\n        <li>L\u00edneas de control que entran desde otro edificio o desde otra \u00e1rea de puesta a tierra.<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-mini-card\">\r\n      <span class=\"leeyee-small-label\">Menor riesgo<\/span>\r\n      <h3>Puede que no siempre necesite un SPD separado<\/h3>\r\n      <ul>\r\n        <li>Cableado interno muy corto dentro del mismo gabinete.<\/li>\r\n        <li>PLC y m\u00f3dulo de E\/S instalados en un solo recinto protegido.<\/li>\r\n        <li>Sin cable exterior y sin ruta de cable de campo larga.<\/li>\r\n        <li>Se\u00f1al de control no cr\u00edtica de bajo valor.<\/li>\r\n        <li>La especificaci\u00f3n del proyecto no requiere protecci\u00f3n contra sobretensiones en la l\u00ednea de se\u00f1al.<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <p>Para paneles de control OEM, el enfoque m\u00e1s seguro es confirmar esto durante el dise\u00f1o en lugar de esperar hasta la puesta en marcha en el sitio. Una vez que el panel ya ha sido cableado, agregar SPDs de se\u00f1al puede requerir cambios en el dise\u00f1o de terminales, espacio en riel DIN, revisi\u00f3n de conexi\u00f3n a tierra y nuevos diagramas de cableado.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"do-you-need-surge-protection-on-every-plc-io-point\"><\/span>\u00bfNecesita protecci\u00f3n contra sobretensiones en cada punto I\/O de PLC?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Por lo general, no. Instalar un SPD en cada punto de I\/O puede aumentar los costos, el espacio en el gabinete, el tiempo de cableado y la complejidad de mantenimiento.<\/p>\r\n\r\n  <p>Un mejor m\u00e9todo de selecci\u00f3n B2B es agrupar los puntos de I\/O seg\u00fan la exposici\u00f3n:<\/p>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Grupo de I\/O<\/th>\r\n          <th>Nivel de riesgo<\/th>\r\n          <th>Recomendaci\u00f3n pr\u00e1ctica<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Se\u00f1ales internas del gabinete<\/td>\r\n          <td>Bajo<\/td>\r\n          <td>Por lo general, dependen de una buena conexi\u00f3n a tierra del gabinete, separaci\u00f3n de cableado y protecci\u00f3n del lado de alimentaci\u00f3n.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Sensores de m\u00e1quina montados cortos<\/td>\r\n          <td>Medio<\/td>\r\n          <td>Revisar la ruta del cable, el entorno de la m\u00e1quina y la especificaci\u00f3n del cliente.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Sensores exteriores o cables de campo largos<\/td>\r\n          <td>Alta<\/td>\r\n          <td>Utilice SPD de se\u00f1al cerca de la entrada del cable del gabinete o antes del terminal PLC.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>RS485 entre gabinetes o edificios<\/td>\r\n          <td>Alta<\/td>\r\n          <td>Utilice SPD de se\u00f1al RS485 \/ datos adecuado y confirme el voltaje, protocolo, tasa de baudios y conexi\u00f3n a tierra.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Medici\u00f3n de proceso cr\u00edtica<\/td>\r\n          <td>Alta<\/td>\r\n          <td>Proteger la se\u00f1al del lazo anal\u00f3gico o del transmisor donde el tiempo de inactividad o una lectura falsa son costosos.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-note-box\">\r\n    <h3>Regla simple para constructores de paneles<\/h3>\r\n    <p>Si el cable permanece dentro del armario, el riesgo de sobretensi\u00f3n suele ser menor. Si el cable sale del armario y va al campo, tr\u00e1talo como un posible camino de entrada de sobretensi\u00f3n.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"signal-spd-vs-spd-remote-alarm-contact\"><\/span>SPD de se\u00f1al vs contacto de alarma remota SPD<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Estos dos t\u00e9rminos a menudo se confunden, especialmente en armarios PLC.<\/p>\r\n\r\n  <p>A <strong>SPD de se\u00f1al<\/strong> protege una l\u00ednea de comunicaci\u00f3n o control de baja tensi\u00f3n, como RS485, cableado de sensores o un circuito de se\u00f1al industrial.<\/p>\r\n\r\n  <p>En <strong>Contacto de alarma remota SPD<\/strong> es solo un contacto de estado en un SPD de potencia. Indica al PLC si el m\u00f3dulo SPD est\u00e1 normal o fallido. No protege la l\u00ednea de se\u00f1al del PLC en s\u00ed.<\/p>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Art\u00edculo<\/th>\r\n          <th>SPD de Se\u00f1al<\/th>\r\n          <th>Contacto de alarma remota SPD<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Funci\u00f3n principal<\/td>\r\n          <td>Limita la tensi\u00f3n de sobretensi\u00f3n en una l\u00ednea de se\u00f1al o comunicaci\u00f3n.<\/td>\r\n          <td>Env\u00eda el estado del SPD al PLC, BMS, SCADA, l\u00e1mpara o circuito de alarma.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Terminales t\u00edpicos<\/td>\r\n          <td>Terminales de se\u00f1al de entrada\/salida, terminal de PE o a tierra.<\/td>\r\n          <td>Terminales de contacto seco NO\/NC\/COM.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Utilizado para<\/td>\r\n          <td>RS485, l\u00ednea de sensor, 4-20mA, telemetr\u00eda, se\u00f1al de control remoto.<\/td>\r\n          <td>Monitoreo sobre si un cartucho SPD de CA o CC ha fallado.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>\u00bfPuede proteger la I\/O del PLC?<\/td>\r\n          <td>S\u00ed, cuando se selecciona e instala correctamente en la l\u00ednea de se\u00f1al.<\/td>\r\n          <td>No. Solo reporta el estado del SPD.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>Para detalles del cableado de alarma remota, consulte nuestra gu\u00eda: <a href=\"https:\/\/www.cnspd.com\/es\/spd-remote-alarm-plc\/\">Cableado de contacto de alarma remota SPD al PLC<\/a>.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"signal-spd-selection-for-plc-dido-aiao-rs485-and-4-20ma-lines\"><\/span>Selecci\u00f3n de SPD de se\u00f1al para l\u00edneas PLC DI\/DO, AI\/AO, RS485 y 4-20mA<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>El SPD de se\u00f1al correcto es seleccionado por el circuito de se\u00f1al real, no por el tama\u00f1o del armario o el voltaje del sistema de CA.<\/p>\r\n\r\n  <div class=\"leeyee-steps\">\r\n    <div class=\"leeyee-step\">\r\n      <h3>Confirme el tipo de se\u00f1al<\/h3>\r\n      <p>Verifique si la l\u00ednea es DI\/DO, AI\/AO, RS485, 4-20mA, se\u00f1al de sensor, telemetr\u00eda, control remoto u otra l\u00ednea de comunicaci\u00f3n de bajo voltaje.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <h3>Coincida el voltaje de operaci\u00f3n<\/h3>\r\n      <p>El voltaje SPD seleccionado debe ser adecuado para el voltaje de se\u00f1al normal. Una l\u00ednea de se\u00f1al de 5V, 12V, 24V o 48V no debe tratarse como un circuito de energ\u00eda de CA.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <h3>Verifique la corriente de carga<\/h3>\r\n      <p>El SPD de se\u00f1al debe soportar la corriente normal del bucle o circuito de se\u00f1al. Esto es especialmente importante para bucles anal\u00f3gicos y dispositivos de campo alimentados.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <h3>Verifique el requisito de transmisi\u00f3n<\/h3>\r\n      <p>Para RS485, datos, telemetr\u00eda o l\u00edneas de comunicaci\u00f3n, confirme la tasa de baudios, la distancia de transmisi\u00f3n, el tipo de cable y si el SPD puede afectar la calidad de la se\u00f1al.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <h3>Confirme el conteo de cables y dise\u00f1o de terminales<\/h3>\r\n      <p>Verifique si la l\u00ednea protegida es de 2 hilos, 3 hilos, 4 hilos, par trenzado apantallado o cable multiconductor. La disposici\u00f3n de los terminales SPD debe coincidir con el m\u00e9todo de cableado.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-step\">\r\n      <h3>Planificaci\u00f3n de la conexi\u00f3n a tierra y posici\u00f3n de instalaci\u00f3n<\/h3>\r\n      <p>Instale el SPD de se\u00f1al cerca del lugar donde el cable de campo entra en el gabinete. Mantenga la conexi\u00f3n a tierra corta y directa. Evite enrutarse el cable de campo no protegido profundamente en el \u00e1rea limpia de cableado PLC.<\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"recommended-selection-by-plc-signal-type\"><\/span>Selecci\u00f3n recomendada por tipo de se\u00f1al PLC<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Aplicaci\u00f3n<\/th>\r\n          <th>Qu\u00e9 Confirmar<\/th>\r\n          <th>Direcci\u00f3n de selecci\u00f3n de SPD<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Entrada digital de 24V<\/td>\r\n          <td>Tipo de entrada, longitud de cable, voltaje de campo, referencia com\u00fan, disposici\u00f3n de terminales<\/td>\r\n          <td>Utilice un SPD de se\u00f1al clasificado para la se\u00f1al de control de 24V y cableado de campo adecuado.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Salida digital \/ Se\u00f1al de rel\u00e9<\/td>\r\n          <td>Tipo de carga, frecuencia de conmutaci\u00f3n, carga inductiva, corriente, ruta de cableado<\/td>\r\n          <td>Confirme si se necesita supresi\u00f3n de transitorios cerca de la carga, en la entrada del gabinete o en ambos.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Bucle anal\u00f3gico de 4-20mA<\/td>\r\n          <td>Voltaje del bucle, corriente, ubicaci\u00f3n del transmisor, fuente de alimentaci\u00f3n del bucle, m\u00e9todo de conexi\u00f3n a tierra<\/td>\r\n          <td>Seleccione un SPD de se\u00f1al que no interfiera con la medici\u00f3n anal\u00f3gica y que soporte el voltaje del bucle.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Se\u00f1al anal\u00f3gica de 0-10V<\/td>\r\n          <td>Voltaje de la se\u00f1al, impedancia de entrada, ruta del cable, exposici\u00f3n al ruido<\/td>\r\n          <td>Utilice protecci\u00f3n de se\u00f1al de bajo voltaje adecuada para entradas anal\u00f3gicas sensibles.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>RS485 \/ Modbus RTU<\/td>\r\n          <td>Versi\u00f3n de voltaje, tasa de baudios, longitud del cable, conexi\u00f3n a tierra del apantallamiento, n\u00famero de nodos<\/td>\r\n          <td>Utilice un SPD de se\u00f1al RS485 \/ datos con un rendimiento de transmisi\u00f3n adecuado y baja p\u00e9rdida de inserci\u00f3n.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Sensor \/ Instrumento de campo<\/td>\r\n          <td>Voltaje del sensor, n\u00famero de hilos, tipo de salida, exposici\u00f3n exterior, ruta de bandeja de cable<\/td>\r\n          <td>Elija de acuerdo con el voltaje del sensor y el m\u00e9todo de cableado. Instale antes del PLC o m\u00f3dulo de se\u00f1al.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"plc-signal-spd-parameter-matrix\"><\/span>Matriz de par\u00e1metros de SPD de se\u00f1al PLC<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Esta matriz ayuda a los compradores a traducir el tipo de se\u00f1al del PLC en detalles pr\u00e1cticos de selecci\u00f3n de SPD. No reemplaza una hoja de datos, pero ayuda a evitar el error m\u00e1s com\u00fan: elegir un SPD de se\u00f1al solo por su apariencia o calificaci\u00f3n de kA.<\/p>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>L\u00ednea de se\u00f1al<\/th>\r\n          <th>Voltaje com\u00fan<\/th>\r\n          <th>Enfoque de selecci\u00f3n de SPD<\/th>\r\n          <th>Direcci\u00f3n LEEYEE LY10<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>RS485 \/ Modbus RTU<\/td>\r\n          <td>Dependiente del sistema, a menudo circuito de comunicaci\u00f3n de bajo voltaje<\/td>\r\n          <td>Tasa de transmisi\u00f3n, p\u00e9rdida de inserci\u00f3n, dise\u00f1o de terminales, tratamiento de tierra y blindaje<\/td>\r\n          <td>Confirme la versi\u00f3n de 12V \/ 24V \/ 48V seg\u00fan el circuito de comunicaci\u00f3n real.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>24V DI \/ DO<\/td>\r\n          <td>Se\u00f1al de control de 24V CC<\/td>\r\n          <td>Uc \/ MCOV por encima de la tensi\u00f3n de control normal, corriente de carga, ruta de cableado, puesta a tierra<\/td>\r\n          <td>La versi\u00f3n de 24V con MCOV de 30V CC puede considerarse cuando el circuito cumple los par\u00e1metros del producto.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Bucle anal\u00f3gico de 4-20mA<\/td>\r\n          <td>Normalmente alimentado por una fuente de lazo de 24V<\/td>\r\n          <td>Tensi\u00f3n de lazo, corriente de lazo, precisi\u00f3n de medici\u00f3n, baja perturbaci\u00f3n de la se\u00f1al<\/td>\r\n          <td>Confirme primero la tensi\u00f3n y la corriente del lazo. No seleccione solo por el nombre del m\u00f3dulo de entrada del PLC.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>L\u00ednea de Sensor<\/td>\r\n          <td>12V \/ 24V \/ 48V seg\u00fan el tipo de sensor<\/td>\r\n          <td>Voltaje del sensor, n\u00famero de conductores, tipo de salida, recorrido del cable, exposici\u00f3n al exterior<\/td>\r\n          <td>Ajuste la versi\u00f3n de 12V \/ 24V \/ 48V al circuito real del sensor.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Telemetr\u00eda \/ Control remoto<\/td>\r\n          <td>12V \/ 24V \/ 48V o espec\u00edfico del proyecto<\/td>\r\n          <td>Protocolo, longitud del cable, exposici\u00f3n a sobretensiones, zona de puesta a tierra, disposici\u00f3n de terminales<\/td>\r\n          <td>Ajuste el requisito de voltaje y protocolo antes de confirmar el modelo.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-warning-box\">\r\n    <h3>L\u00edmite profesional<\/h3>\r\n    <p>LY10 es principalmente adecuado para RS485, telemetr\u00eda, control remoto, sensor y l\u00edneas de se\u00f1al industrial de baja tensi\u00f3n cuando los par\u00e1metros del circuito coinciden con la clasificaci\u00f3n del producto.<\/p>\r\n    <p>Para Ethernet, PoE, Profibus, interfaces especiales de comunicaci\u00f3n de alta velocidad o sistemas de bus espec\u00edficos del proyecto, confirme el tipo de interfaz y utilice un protector contra sobretensiones para l\u00edneas de datos compatible en lugar de asumir que un solo modelo sirve para todas las l\u00edneas de se\u00f1al.<\/p>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-product-box\">\r\n    <h2><span class=\"ez-toc-section\" id=\"recommended-leeyee-signal-spd-for-plc-and-rs485-lines\"><\/span>SPD de se\u00f1al LEEYEE recomendado para l\u00edneas PLC y RS485<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <p>Para RS485, telemetr\u00eda, control remoto, PLC, sensor y l\u00edneas de comunicaci\u00f3n industrial, LEEYEE LY10 es un protector contra sobretensiones para se\u00f1ales de datos montado en carril DIN, dise\u00f1ado para armarios de control y circuitos de se\u00f1al industrial.<\/p>\r\n    <p>Las versiones disponibles t\u00edpicas incluyen sistemas de se\u00f1al de 12V, 24V y 48V. El producto est\u00e1 dise\u00f1ado para instalaci\u00f3n en carril DIN y conexi\u00f3n en serie antes de equipos sensibles.<\/p>\r\n\r\n    <div class=\"leeyee-table-wrap\">\r\n      <table class=\"leeyee-table\">\r\n        <thead>\r\n          <tr>\r\n            <th>Par\u00e1metro<\/th>\r\n            <th>Datos de selecci\u00f3n de LY10<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td>Tipo de producto<\/td>\r\n            <td>Protector contra sobretensiones para se\u00f1al RS485 \/ datos<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Tensi\u00f3n nominal de funcionamiento<\/td>\r\n            <td>12V \/ 24V \/ 48V CC<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Tensi\u00f3n m\u00e1xima de funcionamiento continuo<\/td>\r\n            <td>15V \/ 30V \/ 60V CC<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Corriente nominal de carga<\/td>\r\n            <td>500 mA<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Velocidad de transmisi\u00f3n<\/td>\r\n            <td>Hasta 10Mbps<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>P\u00e9rdida de inserci\u00f3n<\/td>\r\n            <td>\u2264 0.2 dB<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Instalaci\u00f3n<\/td>\r\n            <td>Carril DIN de 35mm \/ conexi\u00f3n por terminal<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-button-row\">\r\n      <a class=\"leeyee-article-btn\" href=\"https:\/\/www.cnspd.com\/es\/ly10-data-signaldc-surge-protective-device-2-product\/\">\r\n        <span>Ver SPD de se\u00f1al LY10<\/span>\r\n      <\/a>\r\n      <button type=\"button\" class=\"leeyee-site-popup-btn leeyee-inquiry-btn\" aria-label=\"Solicitar Recomendaci\u00f3n de Modelo\">\r\n        <span class=\"w-btn-label\">Solicitar Recomendaci\u00f3n de Modelo<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-should-the-signal-spd-be-installed\"><\/span>\u00bfD\u00f3nde debe instalarse el SPD de se\u00f1al?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Para paneles de control PLC, la ubicaci\u00f3n pr\u00e1ctica recomendada suele ser cerca del punto de entrada del cable de campo, antes de que el cable llegue al terminal del PLC o al m\u00f3dulo de comunicaciones.<\/p>\r\n\r\n  <p>Esto ayuda a detener la sobretensi\u00f3n antes de que atraviese el \u00e1rea de cableado de control limpio dentro del gabinete.<\/p>\r\n\r\n  <figure class=\"leeyee-article-figure\">\r\n    <img src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/signal-spd-installation-position-for-plc-io-lines-scaled.webp\" alt=\"Signal SPD installation position for PLC I O lines at field cable entry inside an industrial control panel\" loading=\"lazy\" decoding=\"async\">\r\n    <figcaption>Instale el SPD de se\u00f1al cerca del punto de entrada del cable de campo, con una conexi\u00f3n PE corta, antes de que el cableado protegido llegue al m\u00f3dulo de E\/S del PLC.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Posici\u00f3n de instalaci\u00f3n<\/th>\r\n          <th>\u00bfRecomendado?<\/th>\r\n          <th>Raz\u00f3n<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>En la hilera de bornes de entrada del cable de campo<\/td>\r\n          <td>Mejor pr\u00e1ctica<\/td>\r\n          <td>Interceta la sobretensi\u00f3n antes de que entre en el \u00e1rea de cableado del PLC.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Justo al lado del m\u00f3dulo PLC<\/td>\r\n          <td>A veces aceptable<\/td>\r\n          <td>Mejor que no tener protecci\u00f3n, pero el cable sin protecci\u00f3n a\u00fan puede discurrir dentro del armario.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Solo en el panel principal de CA<\/td>\r\n          <td>No es suficiente para las l\u00edneas de se\u00f1al<\/td>\r\n          <td>El SPD de CA no limita el cable de se\u00f1al de baja tensi\u00f3n que entra en los terminales del PLC.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Solo en el dispositivo de campo remoto<\/td>\r\n          <td>Depende del dise\u00f1o<\/td>\r\n          <td>Puede proteger el dispositivo de campo, pero es posible que el lado del PLC todav\u00eda necesite protecci\u00f3n si el cable es largo o est\u00e1 expuesto.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-warning-box\">\r\n    <h3>Error Com\u00fan<\/h3>\r\n    <p>No instale el SPD de se\u00f1al lejos del equipo protegido y luego tiende un cableado de se\u00f1al largo y sin protecci\u00f3n dentro del gabinete de control. El cable entre el punto de entrada y el PLC a\u00fan puede llevar energ\u00eda de sobretensi\u00f3n y ruido a la zona sensible.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-happens-if-plc-signal-lines-are-not-protected\"><\/span>\u00bfQu\u00e9 sucede si las l\u00edneas de se\u00f1al PLC no est\u00e1n protegidas?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>La falla no siempre se manifiesta como un componente quemado. En muchos sitios industriales, los problemas de se\u00f1al relacionados con sobretensiones aparecen primero como comunicaci\u00f3n inestable, alarmas de entrada aleatorias, deriva en la medici\u00f3n anal\u00f3gica o fallas repetidas del mismo canal de E\/S.<\/p>\r\n\r\n  <p>Los resultados posibles incluyen:<\/p>\r\n\r\n  <ul>\r\n    <li>Da\u00f1o al puerto de comunicaci\u00f3n del PLC.<\/li>\r\n    <li>P\u00e9rdida de comunicaci\u00f3n RS485 o Modbus RTU.<\/li>\r\n    <li>Inestabilidad en la lectura de la entrada anal\u00f3gica.<\/li>\r\n    <li>Falsa alarma de los sensores de campo.<\/li>\r\n    <li>Reemplazo repetido del m\u00f3dulo de E\/S.<\/li>\r\n    <li>Parada inesperada de la m\u00e1quina o tiempo de inactividad de producci\u00f3n.<\/li>\r\n    <li>Hard-to-diagnose intermittent faults after storms or switching events.<\/li>\r\n  <\/ul>\r\n\r\n  <p>For factory maintenance teams, these failures are expensive because the damaged PLC module is only part of the cost. The bigger cost is troubleshooting time, line stoppage, emergency replacement, and repeated site visits.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"before-ordering-signal-spd-for-plc-panels\"><\/span>Antes de pedir SPD de se\u00f1al para paneles de PLC<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <figure class=\"leeyee-article-figure\">\r\n    <img src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/plc-signal-spd-selection-checklist-scaled.webp\" alt=\"PLC signal SPD selection checklist for DI DO AI AO RS485 4-20mA sensor and field device lines\" loading=\"lazy\" decoding=\"async\">\r\n    <figcaption>Before ordering signal SPD for PLC panels, confirm the signal type, voltage, current, communication requirement, wiring method, and installation condition.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-check-box\">\r\n    <h3>Send These Details for Faster Model Selection<\/h3>\r\n    <ul>\r\n      <li>Signal type: DI, DO, AI, AO, RS485, 4-20mA, sensor, telemetry, or other.<\/li>\r\n      <li>Normal operating voltage: 5V, 12V, 24V, 48V, or other.<\/li>\r\n      <li>Maximum continuous voltage required by the project.<\/li>\r\n      <li>Load current or loop current.<\/li>\r\n      <li>Protocol and baud rate for communication lines.<\/li>\r\n      <li>Number of wires and terminal arrangement.<\/li>\r\n      <li>Cable route: indoor, outdoor, between cabinets, between buildings, or near power cables.<\/li>\r\n      <li>Grounding method and shield grounding requirement.<\/li>\r\n      <li>Installation space: DIN rail width, terminal layout, cabinet depth.<\/li>\r\n      <li>OEM label, private label, datasheet, packaging, or wiring diagram requirements.<\/li>\r\n    <\/ul>\r\n\r\n    <div class=\"leeyee-button-row\">\r\n      <button type=\"button\" class=\"leeyee-site-popup-btn leeyee-inquiry-btn\" aria-label=\"Send Your PLC Signal Requirement\">\r\n        <span class=\"w-btn-label\">Send Your PLC Signal Requirement<\/span>\r\n      <\/button>\r\n      <a class=\"leeyee-article-btn secondary\" href=\"https:\/\/www.cnspd.com\/es\/proteccion-contra-sobretensiones-para-paneles-de-control-industrial\/\">\r\n        <span>View Control Panel SPD Guide<\/span>\r\n      <\/a>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-selection-mistakes\"><\/span>Errores comunes de selecci\u00f3n<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Error<\/th>\r\n          <th>Why It Is a Problem<\/th>\r\n          <th>Mejor pr\u00e1ctica<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Using an AC SPD on RS485 or signal line<\/td>\r\n          <td>AC SPD voltage level and test standard are not suitable for low-voltage data lines.<\/td>\r\n          <td>Use a signal\/data SPD matched to the communication or control circuit.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Choosing only by kA rating<\/td>\r\n          <td>Signal SPD selection also depends on voltage, current, transmission rate, and wiring method.<\/td>\r\n          <td>Confirm the actual signal circuit before selecting the SPD.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Ignoring insertion loss or data rate<\/td>\r\n          <td>Wrong SPD may affect communication quality on RS485 or data lines.<\/td>\r\n          <td>Check transmission rate, insertion loss, baud rate, and cable length.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Installing SPD without good grounding<\/td>\r\n          <td>Poor grounding limits the surge discharge path and reduces protection effect.<\/td>\r\n          <td>Keep grounding short, direct, and consistent with cabinet grounding design.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Confusing remote alarm contact with signal SPD<\/td>\r\n          <td>Remote contact only reports SPD status. It does not protect signal wiring.<\/td>\r\n          <td>Use remote alarm for monitoring and signal SPD for signal-line protection.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Protecting only one side of a long outdoor line<\/td>\r\n          <td>Long cable routes may expose both equipment ends to surge risk.<\/td>\r\n          <td>Review whether both PLC side and field device side need coordinated protection.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"related-reading\"><\/span>Lectura relacionada<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>If you are designing a complete industrial control panel, these pages can help you separate power-side protection, signal-side protection, and monitoring requirements.<\/p>\r\n\r\n  <ul class=\"leeyee-related-list\">\r\n    <li><a href=\"https:\/\/www.cnspd.com\/es\/proteccion-contra-sobretensiones-para-paneles-de-control-industrial\/\">Protecci\u00f3n contra sobretensiones para paneles de control industriales<\/a> \u2014 for complete AC, DC, PLC, VFD, and control cabinet protection logic.<\/li>\r\n    <li><a href=\"https:\/\/www.cnspd.com\/es\/rs485-spd-guide\/\">Gu\u00eda de cableado y selecci\u00f3n de SPD RS485<\/a> \u2014 for RS485 \/ Modbus RTU signal line protection.<\/li>\r\n    <li><a href=\"https:\/\/www.cnspd.com\/es\/spd-remote-alarm-plc\/\">Cableado de contacto de alarma remota SPD al PLC<\/a> \u2014 for NO \/ NC \/ COM dry contact monitoring.<\/li>\r\n    <li><a href=\"https:\/\/www.cnspd.com\/es\/ly10-data-signaldc-surge-protective-device-2-product\/\">LY10 RS485 DIN-Rail Data Signal Surge Protector<\/a> \u2014 for RS485, PLC, telemetry, sensor, and industrial signal lines.<\/li>\r\n  <\/ul>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"faq-plc-io-signal-surge-protection\"><\/span>FAQ: Protecci\u00f3n contra sobretensiones de se\u00f1al I\/O de PLC<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-faq\">\r\n    <details>\r\n      <summary>Do PLC signal lines need surge protection?<\/summary>\r\n      <p>PLC signal lines need surge protection when they connect to outdoor sensors, long field cables, remote I\/O, RS485 networks, field instruments, or devices installed in another cabinet or grounding zone. Short internal cabinet wiring may not always need a separate signal SPD.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What is the difference between PLC I\/O surge protection and AC panel surge protection?<\/summary>\r\n      <p>AC panel surge protection protects the incoming power side of the control cabinet. PLC I\/O surge protection protects low-voltage signal paths such as digital input, analog input, RS485, 4-20mA, sensor, and field device wiring. These two protection points serve different circuits.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can an AC Type 2 SPD protect PLC I\/O terminals?<\/summary>\r\n      <p>An AC Type 2 SPD protects the power input of the control cabinet. It does not directly protect low-voltage signal wiring connected to PLC I\/O or communication terminals. Signal lines need suitable signal SPDs when they are exposed to surge risk.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Should every PLC input and output have a surge protector?<\/summary>\r\n      <p>Not always. A practical design protects the high-risk lines first: outdoor sensors, long field cables, RS485 bus lines, remote I\/O, analog loops, and cables running near motors or VFDs. Internal short wiring inside the same cabinet may not need one SPD per point.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can I use one signal SPD for multiple PLC I\/O lines?<\/summary>\r\n      <p>Only when the SPD design, terminal arrangement, voltage rating, current capacity, and wiring method are suitable for those lines. Do not combine unrelated signal types blindly. RS485, analog loop, digital input, and sensor lines may need different protection arrangements.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What voltage signal SPD should I choose for a 24V PLC input?<\/summary>\r\n      <p>Choose a signal SPD whose rated voltage and maximum continuous operating voltage are suitable for the normal 24V DC control signal. For example, a 24V signal SPD with a suitable MCOV above the normal working voltage may be considered, but the final choice should also check current, wiring method, grounding, and project requirements.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What SPD should be used for RS485 connected to a PLC?<\/summary>\r\n      <p>Use a data or signal SPD designed for RS485 and similar industrial communication circuits. Confirm voltage version, baud rate, transmission distance, insertion loss, number of wires, shield grounding, and installation position before ordering.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can a signal SPD be used for 4-20mA analog loops?<\/summary>\r\n      <p>Yes, if the SPD is suitable for the loop voltage, loop current, wiring method, and measurement accuracy requirement. The SPD should protect the analog signal without disturbing normal 4-20mA operation.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Where should a signal SPD be installed in a PLC cabinet?<\/summary>\r\n      <p>Install it close to the field cable entry point or terminal row before the signal wire reaches the PLC module. Keep the grounding connection short and direct, and avoid long unprotected signal wiring inside the clean control area.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Is an SPD remote alarm contact the same as signal surge protection?<\/summary>\r\n      <p>No. A remote alarm contact is a dry contact used to report SPD status to a PLC, BMS, SCADA, lamp, or alarm circuit. A signal SPD is installed in the signal line to limit surge voltage before it reaches sensitive equipment.<\/p>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What information should I send to choose a PLC signal SPD?<\/summary>\r\n      <p>Send the signal type, operating voltage, line current, protocol, baud rate, number of wires, cable route, grounding method, cabinet installation space, and any OEM label or wiring diagram requirement. This helps the supplier recommend a suitable signal SPD model faster.<\/p>\r\n    <\/details>\r\n  <\/div>\r\n\r\n  <section class=\"leeyee-cta-box\">\r\n    <h2><span class=\"ez-toc-section\" id=\"need-help-choosing-signal-spd-for-a-plc-control-panel\"><\/span>\u00bfNecesita ayuda para elegir SPD de se\u00f1al para un panel de control PLC?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <p>Send us your PLC signal type, voltage, cable route, and cabinet layout. LEEYEE can help recommend a suitable signal SPD for RS485, sensor, telemetry, remote-control, and industrial communication lines.<\/p>\r\n    <div class=\"leeyee-button-row\">\r\n      <button type=\"button\" class=\"leeyee-site-popup-btn leeyee-inquiry-btn\" aria-label=\"Request Signal SPD Selection\">\r\n        <span class=\"w-btn-label\">Request Signal SPD Selection<\/span>\r\n      <\/button>\r\n      <a class=\"leeyee-article-btn secondary\" href=\"https:\/\/www.cnspd.com\/es\/ly10-data-signaldc-surge-protective-device-2-product\/\">\r\n        <span>View LY10 Product Page<\/span>\r\n      <\/a>\r\n    <\/div>\r\n  <\/section>\r\n\r\n<\/article>\r\n\r\n<script>\r\n  document.addEventListener('DOMContentLoaded', function () {\r\n    var popupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n    popupButtons.forEach(function (button) {\r\n      button.addEventListener('click', function () {\r\n        var realPopupTrigger = document.querySelector('.w-popup.ush_popup_1 .w-popup-trigger');\r\n\r\n        if (realPopupTrigger) {\r\n          realPopupTrigger.click();\r\n        } else {\r\n          window.open('https:\/\/www.cnspd.com\/contact\/', '_blank', 'noopener');\r\n        }\r\n      });\r\n    });\r\n  });\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Technical guide for PLC control panels A PLC cabinet may already have an AC surge protective device at the power input, but that does not automatically protect the PLC signal terminals. Many PLC failures come through the \u201csmall\u201d lines: digital input, digital output, analog input, analog output, RS485, 4-20mA loop, sensor cable, remote I\/O cable,&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,488,422],"tags":[],"class_list":["post-29895","post","type-post","status-publish","format-standard","hentry","category-news","category-surge-protection","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PLC I\/O Signal Surge Protection Guide | Signal SPD for Control Panels<\/title>\n<meta name=\"description\" content=\"Learn when PLC DI\/DO, AI\/AO, RS485, 4-20mA, sensor and field device lines need signal surge protection, and how to choose the right DIN rail signal SPD for industrial control panels.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PLC I\/O Signal Surge Protection Guide | Signal SPD for Control Panels\" \/>\n<meta property=\"og:description\" content=\"Learn when PLC DI\/DO, AI\/AO, RS485, 4-20mA, sensor and field device lines need signal surge protection, and how to choose the right DIN rail signal SPD for industrial control panels.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/es\/plc-io-signal-surge-protection\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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